Side by side

Tudor Black Bay One 31 S&GvsZelos Helica

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Black Bay One 31 S&G
TudorBlack Bay One 31 S&G
MSRP $6,850
Helica
ZelosHelica
MSRP $499

At a glance

12 of 29 specs differ
Diameter
Black Bay One 31 S&G31mm
Helica39mm
Power Reserve
Black Bay One 31 S&G50h
Helica40h
Water Resistance
Black Bay One 31 S&G100m
Helica100m
MSRP
Black Bay One 31 S&G$6,850
Helica$499

Full specifications

Case

8 specs
Category
Diver
Diameter
31mm
39mm
Thickness
9.5mm
10.5mm
Lug-to-Lug
46mm
39mm
Lug Width
17mm
20mm
Material
Stainless Steel
316L Stainless Steel
Finish
Polished + Satin
Brushed and polished
Caseback
Solid screw-down
Solid

Crystal & Dial

1 specs
Dial Color
Black
39 - Wave MOP

Movement

2 specs
Caliber
MT5201
Miyota 9015
Power Reserve
50h
40h

Pricing

1 specs
MSRP
$6,850
$499

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Tudor Black Bay One 31 S&G

The Tudor Black Bay One 31 S&G is praised for its quiet luxury, combining brushed steel and warm gold accents for understated charm. Owners appreciate the brushed gold for a casual two-tone look and the champagne dial's surprising legibility. Some find the case sides too thick, and one user expressed a desire for a smaller S&G variant. The watch features the MT5612 movement with a 70-hour power reserve and a date function, within a 200-meter water-resistant case. Overall, owners and reviewers highlight the Tudor Black Bay One 31 S&G's balanced two-tone aesthetic as its primary appeal.

Zelos Helica

Owners widely praise the Zelos Helica for its stunning, often color-shifting dials, with specific mentions of the MoP, slate grey, 'Steel Blue', and red opal variants being particularly captivating and artful. The 39mm case size is noted as fitting well on smaller wrists, and the overall build quality and finishing for the price are frequently highlighted as impressive, with one owner calling it "a lot of watch for the price." Some owners appreciate the novel bracelet designs and full lume dials, while others find the bracelet and clasp edges sharp or the clasp lacking on-the-fly adjustment. Opinions on the date window are mixed, with one owner disliking it. The Zelos Helica Moonphase was considered cluttered by one owner, and its $1K USD price point was felt to be steep by another, though popular variants sold out rapidly. Overall, owners rate the Zelos Helica highly for its striking dial designs and impressive value proposition.

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